Thursday

October 30, 2014

October 30, 2014

Posted by **stefanie** on Sunday, May 2, 2010 at 11:43am.

a. Find the margin of error E for a 90% confidence interval.

Round your answer to the nearest hundredths.

- statistics -
**MathGuru**, Sunday, May 2, 2010 at 6:15pmMargin of error = z-value (sd/√n)

Find the z-value corresponding to 90% confidence using a z-table.

sd = standard deviation

n = sample size

I hope this will help get you started.

- statistics -
**Anonymous**, Tuesday, June 1, 2010 at 11:54amPlease someone help me? The new twinkle bulb has a standard deviation 35 hours. A random sample of 50 light bulbs is selected from inventory. The sample mean was found to be x=500 hrs. Find the margin of error for 95%, construct a 95% confidence interval for the mean life of all Twinkle bulbs. I am desperate.

**Answer this Question**

**Related Questions**

statistics - 1. The new Twinkle bulb has a standard deviation σ = 34 hours...

Statistics - A company has developed a new type of light bulb, and wants to ...

Statistics - Can anyone tell me how to use TI-84 calculator to solve this ...

statitics - a light bulb manufacture gaurentees that the mean life of a certain ...

math - 1) A light bulb producing company states that its lights will last an ...

statistics - The new Twinkle bulb is being developed to last more than 1000 ...

statistics - Solve the problem. The lifetime of a new brand of light bulb can be...

statistics - A specific study found that the average number of doctor visits per...

statistics - A specific study found that the average number of doctor visits per...

Statistics - . A random sample is selected from a normal population with a mean ...